The basic function of the FIXED type is to accept the bulk of the horizontal loads thus typically a high capacity attachment system is required&period; This can be achieved by the use of a bolt &sol; socket system or by being directly bolted to cast in attachment plates&period;

Typically&comma; the FREE FLOAT type requires only minimal retention to the structure&period; Friction&comma; a grooved recess into the top and bottom of the bearing&comma; subsequently filled with grout&comma; placement into a shallow recess&comma; or similar simple techniques is often sufficient to locate and restrain this type of bearing&period;

The GUIDE &sol; SLIDE type requires positive retention&comma; typically by means of a bolt &sol; socket system&comma; or by bolting to a cast in attachment plate&period; Such attachment plate can be for either or both&comma; substructure and superstructure&period;